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Details are given herein of the development, refinement and application of a higher-order accurate 3-D finite difference model for non-cohesive suspended sediment transport processes, in non-stratified estuarine and coastal waters. The velocity fields are computed using a 2-D horizontal depth-integrated model, in combination with either an assumed Iogarithmic velocity profile or a velocity profile obtained from field data. Also, for convenience in handling variable bed topographies and for better vertical resolution, a sigma-stretching co-ordinate system has been used. In order to gain insight into the relative merits of various numerical schemes for modelling the convection of high concentration gradients, in terms of both accuracy and efficiency, thirty six existing finite difference schemes and two splitting techniques have been reviewed and compared by applying them to the following cases:....
In recent years there has been growing concern about the management of wetlands, particularly in the USA and increasingly in Europe. These wetlands, ranging from a small harbour, such as Christchurch in the UK, to the large mangrove swamps of Malaysia, are natural resources which require comprehensive management. Whilst considerable research has been undertaken and documented on the management of wetland ecosystems, little emphasis has been focused on the geomorphic, hydraulic and hydrologic behaviour of wetlands and the consequent implications for practical management solutions.
In this thesis, the theory of three dimensional numerical modeling of transport and re-suspension of fine sediments is studied and a computer program is develped for simulation of the three dimensional suspended sediment transport. The computer program solves the three dimensional advection-diffusion equation simultaneously with a computer program prepared earlier for the simulation of three dimensional current systems. This computer program computes the velocity vectors, eddy viscosities and water surface elavations which are used as inputs by the program of fine sediment transport. The model is applied to Bay of Izmir for different wind conditions.
The interface of 440,000 km long coastline in the world is subject to global change, with an increasing human pressure (land use, buildings, sand mining, dredging) and increasing population. Improving our knowledge on involved mechanisms and sediment transport processes, monitoring the evolution of sedimentary stocks and anticipating changes in littoral and coastal zones is essential for this purpose. The special issue of Water on “Sediment transport in coastal waters” gathers thirteen papers which introduce the current revolution in the scientific research related to coastal and littoral hydrosedimentary dynamics, and reflect the diversity of concerns on which research in coastal sediment transport is based, and current trends — topics and preferred methods — to address them.
Coastal reservoirs are viewed in many regions of the world as an emerging concept of storing fresh water when the river basin is in flood. Similar reservoirs (or impoundments) can be used to generate tidal renewable energy and/or provide the catalysis for urban regeneration. Constructed near the coast in natural river basins, these reservoirs have a smaller environmental footprint and are less obstructive than inland dams. Written by an international group of Civil, Environmental, and Geotechnical Engineers, Sustainable Water Resource Development using Coastal Reservoirs discusses the latest research and breakthroughs in their use, while offering expert advice into their sustainable design and construction. The perfect reference for researchers exploring the feasibility of this emerging technology or experienced professionals who wish to implement this technology as a water scarcity solution or a tidal renewable energy source or for urban regeneration, Sustainable Water Resource Development using Coastal Reservoirs provides an expert resource to the design, construction and use of coastal reservoirs. The reference begins with a brief but readable examination of water quantity, quality design and geotechnical considerations. The book includes international case studies to clearly illustrate the various uses, design, planning, construction, and operation methods. These case studies include projects such as: Afsluitdijk in the IJsselmeer, (Netherlands), Zuiderzee (Netherlands), Thanneermukkom Bund (India), Sihwa (South Korea), Saemangeum, (South Korea), Chenhang (China), Plover Cove (China), and Marina Barrage (Singapore). Explores the feasibility/design implications for Coastal Reservoirs based on estimation of runoff, detailed assessment of water demand and estimation of water quality Provides design schemes/procedures for the construction and operation of coastal reservoirs Includes case studies to illustrate the design, planning, construction and operations of coastal reservoirs from around the world
In Honor of Prof. Walter Hansen on Occasion of his 7o. Birthday